1 List of United States cities by population. ^ 2  Population projection is that of the entity known since 2016 as Ciudad de MÃ©xico and previously as the Distrito Federal. ^  Population estimate is that of the Toronto census division, which consists solely of the City of Toronto.
Lens (optics) For other uses, see Lens. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.
What is difference between polarized and non-polarized lenses? A: Polarized lenses have a filter laminated on them that only allows vertically oriented light to pass through, while non-polarized lenses are usually just tinted to block light. Non-polarized lenses do not contain a filter to remove glare. Continue Reading.